An additional source of Fe was the primary iron oxides (ilmenite, magnetite, Figure 1), which were present as accessory minerals
and thus also at low concentrations.
The main accessory minerals
of these gabbros appear within the interstitial matrix (Fig.
Fluorapatite, zircon, Nb-Ta-Ti oxides, xenotime-(Y) and monazite-(Ce) are rare accessory minerals
In order to identify the accessory minerals
in the region of Ghareh Gheshlegh, field research and laboratory studies were carried out.
include amphibole, aegirine, sphene, rutile, zircon and apatite (Jan et al.
(fine-grained microlitic zircon, apatite, monazite, and allanite) were identified and confirmed using a scanning electron microscope including backscattered electron imaging, energy-dispersive X-ray spectroscopy and X-ray element mapping.
4b), indicates the absence of fine-grained phosphatic and titaniferous accessory minerals
hosting these elements.
Siderite is a more common accessory mineral
in NE Estonian rocks.
He-diffusion studies have also been conducted for other common minerals such as titanite, monazite, hematite, and zircon, all of which are common accessory minerals
in igneous and metamorphic rocks.
This specific deposit contains 70 per cent calcite, a form of calcium carbonate; 10 per cent apatite, a rock phosphate (source of calcium and phosphorous); 15 per cent biotite/vermiculite; and 5 per cent of accessory minerals
such as pyroxene, chlorite, magnetite, and feldspar.
The three papers in the first section focus on petrological observations combined with trace element and isotopic data of accessory minerals
to link their formation with major mineral phases, and ultimately to the pressure-temperature-time path of metamorphic rocks.
Apatite, zircon, and rutile are typical accessory minerals